Assigitok



s. w. MARTIN.

BY-PASS DRAFT FAN.

APPLICATION FILED FEB. 5; Isle; 1 ,3 1 5,028 m Patented Sept. 2, 1919.

Z SHEETS-SHEET I.

THE COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

G. W. MARTIN.

BY-PASS DRAFT FAN.

APPLICATION FILED FEB. 5, 191a.

Patented Sept. 2, 1919.

2 SHEETS-SHEET 2- ATES AT T FF j enonen w. MARTIN, or roar won'rn, Texas, Assrcnon o oin MILIJMACI-IINERY &

MANUFACTURING 00., or roar WORTH, 'rnxnsyn conronarron or Texas;

BY-BASS innarraran. A

Specification of Letters Patent:

Application filed February 5, 1919. Serial No. 275,190.

To all whom it may concern: p a

Be it known that I, GEORGE W. MARTIN, a citizen of the United States of America, residing at Forth Worth, in thecounty of Tarrant and State of Texas, have invented a new and Improved By-Pass Draft-Fan, of which the following is a specification.

My invention relates. to draft fans and more particularly to bypass fans; and the object is to provide fans for general purposes of pneumatic conveyors for handling seed cotton, cotton seed, lint, hair, peanuts, rice bran, and other articles, the principal object being to provide fans which willnot strike the material passing therethrough with the blades of the fans and which will not otherwise batter or hammer the material which is passing through the fans. One of the objects is to utilize air in its most powerful form,air in spiral revolutions or rotations and cyclonic in effect. Other objects and advantages will be fully explained in the following description andthe invention willbemore particularly pointed out in the claims. 1

Reference is had to the accompanying drawings which form a part of this application. p a 1 p I 1 Figure 1 is a. side elevation of the improved fan. Fig. 2 is an interior elevation, the conical side of the casing being removed. Fig. 3 is a vertical section,taken onrthe elevation of the conical side of the casing, showing the position of the air cut-oil. ,Fig. 5 is a section of the conical slde of the easling, taken on the line 55 of Fig. 4;.

Similar characters of reference are used to indicate the same parts throughout'the The back casing of the fan consists of a truncated conical casting 4 and a flat sheet metal ring plate 5. The peripheral partof r the casing 6. is somewhat in the forinof a geometrical spiral, or it is a progress ve curve. The frontlpart 7 of the casing has a coneshaped portion. 8 which houses a balilelcone .9 and cooperates therewith. The baiile cone ,9 is made rigid with thefan bya conical casting 10 and a screw bolt 11. The

.fle. 9.. line 3-8 of Fig.1 1. Fig. 4 is an interior I end of somewhat conical and the screw boltfll clamps the castingrigidly b1 .heshaft1 and the cone 9 is riveted t0 the cast'ing IO... The fan ispro vided with arearba e 12 andafront baffle 13 which 311361111 form truncated cones andthegfan blades are riveted to the bafiies. The casing ofthe fan isbraced by curved angle bars 1 1 which are bolted to the member. 6 andto the sideframe members 5 andQ'Z.

The cone-baffle 9.;must .be spaced from the fan. and anannularspace must be provided between the fan baifle13 unobstructed by anything. connecting the cone baffle to the baflie..13., Theicone baffle must cover a sufficient portion of the bafiie to prevent ma terial from passing tothefan blades. The

Patented Sept. 2,1919.

cone baflie nmust. be properly spaced from p the cone 8 and the space between these two members .willbe different for different materials, being greater forsome materials and lessfor other-materials. The fan is connection witha suitable flue. The fan is provided with an intake16 which is. connectedto the intake opening 17 in the cone provided with an. outlet or discharge 15 for the conicallsideiof the casing, having 3 an,

angular portion,19 connected to the part 71 0f. the casing The. aircut-off must be properly located relative to the cone baf- The. effect. ntering into the ,cone against the. cone. bafile 9 is to multiply the force of the airand makeit cyclonic in effect. 'The air in passing about the cone @bafile is like the air 111121 .fu11118l-Sl1LP(Cl.tOT-

.naclo, and, commencing near the apex of...

the cone, grows in intensity as it passes toward the base of the cone to bedischarged throughflthe outlet 15. p The air cut-off 18 .ancl19 directs the material; and air out through the discharge outlet 15. The admission of air is entirely through the cone 8 and all material to bemoved also enters throughthe cone 8 and none of the material to be moved ever touches the fan blades.

The material entering through. inlet 16, 1

.leannot pass the flow orcurrent of airfiat the point 30 into the wheel blades. The fanwheelforces the airinto the cone 9 and the air deflected by. expansion and passes out at the base of the cone or point 30,1naking at this point 30 the strongest current of air. This accomplishes both purposes, that is, preventing the material from striking and damaging the blades of the fan wheel, and protecting the material frombeing damaged by the blades of the fan.

Various changes in the sizes, proportions, construction, and arrangement of the several parts may be made without departing from the spirit of my invention.

What I claim is 1. A. by-pass fan comprising revolving fan blades provided with a shaft, a discharge outlet for the fan, conical members, one revolving with the fan and the other stationary, form-ing a conical by-pass at one side of the fan communicating with said outlet, a cut-ofi intercepting said bypass for directing material and air to said outlet and an inlet communicating with said'by-pass.

2. A by-pass fan comprising revolving fan blades and a shaft therefor, conical members atone side of said fan forming a conical by-pass, a baflle between said conical members and the fan blades for preventing material from entering the path of the fan blades, a discharge outlet for the fan, and an inlet communicating with said by-pass.

3. A by-pass draft fan comprising revolving fan blades and a shaft therefor, a casing for the fan provided with a discharge outlet and havin a conical casing member on one side, a ba e cone rigid with said shaft and spaced from said conical casing member, an air cut-ofi' intercepting the space betweensaid cone baffle and conical casing, for directing material and air to'said outlet, and an inlet communicatin with the space between said bafile cone and said conical casing member.

4:. A by-pass fan comprising revolving 'fan bladesand a shafttherefor, a discharge outlet for said fan, conical members, one

stationary and the'other revolving with said shaft, forming a conical by-pass at one side of said fan communicating with said outlet, abafile moving with said blades for preventing passing material from entering the path of the fan blades, and an inlet communicating with said conical by-pass.

5. A by-passdraft fan comprising revolving fan blades and a shaft therefor, a casing for said fan provided with a dis charge outlet'and having a conical member on one side, a blade baffle attached to said blades, a battle cone rigid with said shaft and spaced at close proximity from said blade baffle and from said conical casing member, and an inlet communicating with the space between said baffle cone and said conical casing member.

6. A by-pass draft fan comprising revolving fan blades and a shaft therefor, a casavith said shaft and provided fan blades and a shaft fan blades and a shaft baffle attached to said blade, a discharge ing for said fan provided with a discharge outlet and having a conical casing member on one side, a baffle cone rigid with said shaft and conforming in contour with said conical casing member and spaced therefrom and cooperating therewith, and an inlet communicating with the space between said cone and said conical casing member.

7 A by-pass draft fan comprising revolving fan blades and shaft therefor, a casing for said fan having a cone shaped member on one side, a truncated cone bafiie attached to said blades, a baffle cone rigid with said shaft and spaced from said truncated cone baflle and spaced from the conical side member of said casing, an inlet communicating with the space between said cone and conical casing member, and a discharge outlet for said fan.

8. A by-pass fan comprising a casing, a shaft journaled in said casing, a fan rigid with blades, rear and front bafiles attached to said blades, a conveyer cone rigid with said shaft and having its base spaced from said front baffle but terminating in close proximity thereto, a cone shaped casing for one side of said fan conforming in contour to said conveyer cone and spaced therefrom, an intake opening into the space between said conveyer cone and conical casing member, and an outlet for discharging material from the fan.

9. A by-pass fan comprising revolving fan blades and a shaft therefor, a discharge outlet for said fan, conical members, one stationary and the other revolving with said shaft, forming a conical by-pass at one side of said fan communicating with said outlet, a baffle moving with said blades for preventing passin material from entering the path of the fan blades, a cut-off adjacent to said outlet intercepting said bypass for directing material to said outlet, and an inlet communicating with said conical by-pass.

10. A by-pass fan comprising revolving therefor, a blade baffle attached to said blades, a discharge outlet for said fan, a cone baflle rigid at its apex with said shaft and terminating at its base near said blade baffle but spaced therefrom, a conical casing member conforming in contour with said cone bafile but spaced therefrom and forming therewith a conical by-pass communicating with said "outlet, and an inlet leading through said conical casing member into said by-pass.

11. A by-pass fan comprising revolving therefor, a blade outlet for said fan, a cone bafiie rigid at its apex Wltl), said shaft and terminating at its base near said blade bafile but spaced I therefrom and terminating with a curved edge in the base, a conical casing member conforming in contour with said cone bafile but spaced therefrom and forming therewith a conical by-pass communicating with said outlet, an angular cut-off attached to said conical casing member and intercepting said by-pass fordirecting material to said outlet, and an inlet leading through said c0ni cal casing member into said by-pass.

In testimony whereof I set my hand this 18th day of January, 1919.

GEORGE W. MARTIN.

flopies of this patent may be obtained tor five cents each, by addrensing the Commissioner of Iatents, Washington, D. 0. 

